<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .wrap{
            width: 1178px;
            height: 174px;
            overflow: hidden;
            position: relative;
            margin: 0 auto;
        }
        .wrap ul li{
            float: left;
            width: 210px;
            height: 174px;
            overflow: hidden;
        }
        .wrap ul{
            width: 2000px;
        }
        .wrap ul li img{
            width: 550px;
            height: 174px;
        }
    </style>
</head>
<body>
    <div class="wrap">
        <ul>
            <li style='width:550px'><img src="http://pic.shejiben.com/hot_sjb/377_8180.jpg?1462261126" alt=""></li>
            <li ><img src="http://pic.shejiben.com/hot_sjb/377_8288.jpg?1464830033" alt=""></li>
            <li ><img src="http://pic.shejiben.com/hot_sjb/377_8155.jpg?1460709517" alt=""></li>
            <li ><img src="http://pic.shejiben.com/hot_sjb/377_7937.jpg?1456984280" alt=""></li>
        </ul>
    </div>
</body>
<script src="../jquery.js"></script>
<script>
    $(".wrap").find("li").mouseover(function(){
        // 每次开启动画之前，都要先清除
        $(this).stop().animate({
            width:550
        }).siblings().stop().animate({
            width:210
        })
    })
</script>
</html>